14.29 A random sample of 10 students was asked to rate, in a blind taste test, the quality of two brands of ice cream, one reduced-sugar and one regular ice cream. Ratings were based on a scale of 1 (poor) to 10

(excellent).

The accompanying table gives the results.

Use the Wilcoxon test to test, at the 5% level, the null hypothesis that the distribution of the paired differences is centered on 0 against the alternative that the population of all student ice cream consumers prefer the regular brand.

Student Reduced Sugar Regular A 3 9 B 3 4 C 8 6 D 4 4 E 5 4 F 2 8 G 2 9 H 2 3 I 7 5 J 3 7